Jennifer Aniston determined to avoid ex-husband Brad Pitt

Both stars are due at red carpet events to promote movies. "Her people are checking and double checking her schedule to make sure she doesn't go within a mile of Brad, let alone bump into him," says a friend of the single-again actress. "She's already concerned about her break-up with John Mayer overshadowing her movie, so the last thing she wants is another ex in the picture. It's inconvenient having to duck and dive but more than anything she finds it embarrassing."

Image WENN